SR4420Perennial Ryegrass is specially designed
for high turf quality and its resistance to
grey leaf spot, snow mold, brown patch and
crown rust. SR4420is an excellent choice for
golf courses and sports fields because of
its dark green color, good seedling vigor,
fine leaf texture, extremely high fall density
and superior traffic stress tolerance. Perennial
Ryegrass
HISTORY SR4420was developed
at Rutgers University in the fall of 1997
based primarily on its resistance to grey
leaf spot and its excellent heat tolerance.
Following rigorous testing at the Rutgers
Turfgrass Breeding program, seed from 25 plants
with dark green color, high shoot density
and high seed yield was sent for further trials
at Seed Research in the fall of 1998. In the
spring of 1999, it was noted that these progeny
had two distinct heading and anthesis periods.
The progeny from six plants with early heading
were separated from the remainder of the population
and designated SRX 4820, now known as SR4420,
which represents the early transitioning portion
of the population.
CHARACTERISTICS • Excellent gray
leaf spot, dollar spot and crown rust ?Extremely
dark green color
• Quick emergence
• High turf quality with a fine leaf
texture and reduced stemminess
• Long term persistence - excellent
cold and hot weather performance
• Excellent winter color and winter
density when overseeded into dormant bermudagrass
• Early spring green-up in northern
climates. Very high spring, summer, fall and
winter density
• High billbug resistance due to high
endophyte levels
APPLICATION SR4420’sdark
green color makes it ideal for a variety of
turf applications. Blend SR4420with other
perennial ryegrasses for golf course fairways,
sports fields, sod production and home lawns.
It also can be mixed with Kentucky bluegrasses
and fine fescues. In blends with other perennial
ryegrasses or mixed with Poa Trivialis, its
dark green color and high turf quality make
it ideal for overseeding permanent turf.
SEEDING RATE • New turf:7-9
pounds per 1,000 square feet or 300-400 pounds
per acre
• Overseeding rate: 30 pounds per 1,000
square feet for golf greens
250-450 pounds per acre for
roughs
600-700 pounds per acre on fairways
• Seeds per pound:approximately 250,000
GERMINATION • Emergence in
3-7 days under proper conditions. First mowing
2 weeks after emergence.
